diff --git a/remotesyn/toolchains/util_ISE/coregen.py b/remotesyn/toolchains/util_ISE/coregen.py
index 404b723..1b8d5c6 100644
--- a/remotesyn/toolchains/util_ISE/coregen.py
+++ b/remotesyn/toolchains/util_ISE/coregen.py
@@ -10,7 +10,7 @@ def coregen(config, target, log, subprocesses, prefix='.') -> int:
     package = config.get(f'target.{target}', 'package', fallback='')
     speedgrade = config.get(f'target.{target}', 'speedgrade', fallback='')
     coregen_opts = config.get(f'target.{target}', 'coregen_opts', fallback='')
-    files_def = config.get(f'target.{target}', 'files_def', fallback='').split()
+    files_def = config.get(f'target.{target}', 'files_xco', fallback='').split()
     build_dir = config.get(f'project', 'build_dir', fallback='build')
     out_dir = config.get(f'project', 'out_dir', fallback='out')
 
@@ -72,6 +72,10 @@ def coregen(config, target, log, subprocesses, prefix='.') -> int:
                 shutil.copy(f'{build_dir}/{cname}.xco', f'{out_dir}/{cname}.xco')
             except FileNotFoundError:
                 pass
+            try:
+                shutil.copy(f'{build_dir}/{cname}.ucf', f'{out_dir}/{cname}.ucf')
+            except FileNotFoundError:
+                pass
         else:
             return res